It is entirely essential. Again, 75% of everything we produce in Canada is exported down to the United States, $30 billion-plus, and then we bring $33 billion up.
Dave talked about this back and forth. It's much like the auto sector. Raw materials come up. We semi-process them and partially upgrade them. They are turned into a product that goes to somebody else who turns it into another product, and ultimately you have a dashboard in a car or a rubber tire. We have a rubber plant in Sarnia. It's a highly-integrated, complex supply chain. To dismantle that would be very difficult.
I would just add one comment on what you just talked about with the NAFTA bloc. I think that in the chemistry sector we don't look at it that way. We look at the global environment, and we are very keen that Canada pursue rules-based fair trade that's mutually beneficial with those jurisdictions we may have concerns with now. We think there are significant opportunities for Canada, especially given some of the threats we're seeing south of the border, to look for a mutual trade advantage with China and other Asian nations.